I hope that you are healthy when you receive this letter.
11 กุมภาพันธ์ 2017
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It means that " I hope that they are doing well when they read this letter."
11 กุมภาพันธ์ 2017
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It's a polite way of opening a letter (a little old-fashioned, in my opinion, as letters are becoming old-fashioned). It literary means 'I hope you are well'.